Allwinner A20 - Page 209

A20 User Manual (Revision 1.2) Copyright © 2013 Allwinner Technology Co., Ltd. All Rights Reserved. Page 209 / 812
Offset: 0x04
Register Name: TP_CTRL1
Bit
Read/
Write
Default
/Hex
Description
1: start Calibration, it is clear to 0 after calibration
5
R/W
0x0
TP_DUAL_EN.
Touch Panel Double Point Enable
0: Disable
1: Enable
4
R/W
0x0
TP_MODE_EN.
Tp Mode Function Enable
0: Disable
1: Enable
3
R/W
0x1
TP_ADC_SELECT.
Touch Panel and ADC Select
0: TP
1: ADC
2:0
R/W
0x0
ADC_CHAN_SELECT.
Analog input channel Select In Normal mode:
000: X1 channel
001: X2 Channel
010: Y1 Channel
011: Y2 Channel
1xx : 4-channel robin-round
FIFO Access Mode,based on this setting. Selecting one channel,
FIFO will access that channel data; Selecting four channels FIFO will
access each channel data in successive turn, first is X1 data.
1.15.7.3. TP CONTROL REGISTER 2
Offset: 0x08
Register Name: TP_CNT2
Bit
Read/
Write
Default/H
ex
Description
31:28
R/W
0x8
TP_SENSITIVE_ADJUST.
Internal Pull-up Resistor Control
0000 least sensitive
0011
……
1111 most sensitive